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wg_mtu_auto.py — Auto-detect egress IF, optionally probe Path MTU to one or more targets,
compute the correct WireGuard MTU, and apply it.

Examples:
  sudo ./main.py
  sudo ./main.py --force-egress-mtu 1452
  sudo ./main.py --pmtu-target 46.4.224.77 --pmtu-target 2a01:4f8:2201:4695::2
  sudo ./main.py --pmtu-target 46.4.224.77,2a01:4f8:2201:4695::2 --pmtu-policy min
  sudo ./main.py --prefer-wg-egress --auto-pmtu-from-wg
  ./main.py --dry-run
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<01>descriptionz--egress-ifz5Explicit egress interface (auto-detected if omitted).)
<01>helpz--prefer-wg-egress<73>
store_truezXAllow/consider wg* as egress and prefer it if default route uses wg (default: disabled).)<02>actionr<6E>z--auto-pmtu-from-wgzOAutomatically add WireGuard peer endpoints as PMTU targets (default: disabled).z--wg-if<69>WG_IF<49>wg0z(WireGuard interface name (default: wg0).)rAr<>z
--wg-overhead<61>WG_OVERHEAD<41>80z/Bytes of WG overhead to subtract (default: 80).)<03>typerAr<>z--wg-min<69>WG_MIN<49>1280z'Minimum allowed WG MTU (default: 1280).z
--pmtu-targetrMzQTarget hostname/IP to probe PMTU. Can be given multiple times OR comma-separated.z--pmtu-timeout<75><00>?z0Timeout (seconds) per ping probe (default: 1.0).z--pmtu-min-payload<61><64>z4Lower bound payload for PMTU search (default: 1200).z--pmtu-max-payload<61><64>z>Upper bound payload for PMTU search (default: 1472 ~ 1500-28).z
--pmtu-policy)r|r}rfr|zDHow to choose effective PMTU across multiple targets (default: min).)<03>choicesrAr<>z	--dry-runz&Show actions without applying changes.z--set-wg-mtuzTForce a specific MTU to apply on the WireGuard interface (overrides computed value).)r<>r<>z--force-egress-mtuz?Force this MTU on the egress interface before computing wg MTU.)
rPrzD[wg-mtu][ERROR] Could not detect egress interface (use --egress-if).r-rqz[wg-mtu][ERROR] Interface z does not exist.<2E>z$[wg-mtu] Detected egress interface: z#[wg-mtu] Using WireGuard interface z as egress basis.z[wg-mtu][WARN] z0 selected as egress but WireGuard is not active.z[wg-mtu] Forcing egress MTU z on z[wg-mtu] Egress base MTU: <20>
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)z[wg-mtu]  - z: zprobe failedz#[wg-mtu] Selected Path MTU (policy=z): zE[wg-mtu] WARNING: All PMTU probes failed. Falling back to egress MTU.z[wg-mtu] Computed z MTU: z  (overhead=z, min=z[wg-mtu][WARN] --set-wg-mtu z is below wg-min z; clamping to <20>
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